<!DOCTYPE html>
<html>
<head>
	<meta charset="utf-8">
	<meta name="viewport" content="width=device-width, initial-scale=1">
	<title></title>
</head>
<body>
	<script type="text/javascript">
		// 字符串的声明
		// "" '' ``
		let a = ""
		let b = ''
		// 模板字符串 拼接${变量}
		let d = "孙悟空"
		let c = `hello world ${d}`
		console.log(c)//hello world 孙悟空

		// 构造函数的声明方式
		let str = new String("hi")
		console.log(str + d)

		// length返回字符串的长度
		console.log(str.length)

		str[0] = "1"//只读不能改
		console.log(str)//hi
	</script>
</body>
</html>